The invention relates to a group stage wind power generator set state monitoring and fault diagnosis platform, which is characterized in that a user of the platform comprises a wind field layer, a region layer and a group layer, the platform comprises a data collection processing module, a data storage and transmission module and a data analysis and application module, the collection modes of the data collection processing module comprise an off-line collection mode and an on-line collection mode, the data storage and transmission module is in charge of data storage and transmission, a data sparseness technology is used for reducing the data storage and transmission pressure, the data analysis and application module calls relevant data of the platform through a unified open interface, different APP (application) modules are used for analysis, and the equipment performance analysis, equipment health diagnosis, fault diagnosis and information issuing functions are realized. The group stage wind power generator set state monitoring and fault diagnosis platform has the advantages that the wind power state can be comprehensively and effectively evaluated, and the intelligent management of the three-level wind power generation projects including the wind power field, the region and the group is realized.